API_6A718 - Spec of Nickel Alloy Base 718 for Oil and Gas Drilling Equipment

Specification of Nickel Base Alloy 718 (UNS N07718) for Oil and Gas Drilling and Production Equipment

API SPECIFICATION 6A718FIRST EDITION, MARCH 2004

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Upstream Segment

API SPECIFICATION 6A718FIRST EDITION, MARCH 2004



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SPECIAL NOTES

API publications necessarily address problems of a general nature. With respect to partic-ular circumstances, local, state, and federal laws and regulations should be reviewed.

API is not undertaking to meet the duties of employers, manufacturers, or suppliers towarn and properly train and equip their employees, and others exposed, concerning healthand safety risks and precautions, nor undertaking their obligations under local, state, or fed-eral laws.

Information concerning safety and health risks and proper precautions with respect to par-ticular materials and conditions should be obtained from the employer, the manufacturer orsupplier of that material, or the material safety data sheet.

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Generally, API standards are reviewed and revised, reaffirmed, or withdrawn at least everyfive years. Sometimes a one-time extension of up to two years will be added to this reviewcycle. This publication will no longer be in effect five years after its publication date as anoperative API standard or, where an extension has been granted, upon republication. Statusof the publication can be ascertained from the API Standards department telephone (202)682-8000. A catalog of API publications, programs and services is published annually andupdated biannually by API, and available through Global Engineering Documents, 15 Inv-erness Way East, M/S C303B, Englewood, CO 80112-5776.

This document was produced under API standardization procedures that ensure appropri-ate notification and participation in the developmental process and is designated as an APIstandard. Questions concerning the interpretation of the content of this standard or com-ments and questions concerning the procedures under which this standard was developedshould be directed in writing to the Director of the Standards department, American Petro-leum Institute, 1220 L Street, N.W., Washington, D.C. 20005. Requests for permission toreproduce or translate all or any part of the material published herein should be addressed tothe Director, Business Services.

API standards are published to facilitate the broad availability of proven, sound engineer-ing and operating practices. These standards are not intended to obviate the need for apply-ing sound engineering judgment regarding when and where these standards should beutilized. The formulation and publication of API standards is not intended in any way toinhibit anyone from using any other practices.

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Copyright © 2004 American Petroleum Institute



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FOREWORD

This Specification for Nickel Base Alloy 718 (UNS N07718) was formulated by the APIExploration and Production Subcommittee on Valves and Wellheads (Committee 1, Sub-committee 6) Materials Task Group. It is based on the conclusions of a task group evaluationof specification requirements needed for Nickel Base Alloy 718 to supplement the existingrequirements of API Spec 6A and ISO 10423.

This standard shall become effective on the date printed on the cover, but may be used vol-untarily from the date of distribution.

API publications may be used by anyone desiring to do so. Every effort has been made bythe Institute to assure the accuracy and reliability of the data contained in them; however, theInstitute makes no representation, warranty, or guarantee in connection with this publicationand hereby expressly disclaims any liability or responsibility for loss or damage resultingfrom its use or for the violation of any federal, state, or municipal regulation with which thispublication may conflict.

Suggested revisions are invited and should be submitted to API, Standards department,1220 L Street, NW, Washington, DC 20005.

iii



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CONTENTS

Page

1 SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.1 Purpose. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11.2 Applicability. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

2 NORMATIVE REFERENCES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

3 TERMS, DEFINITIONS AND ABBREVIATED TERMS . . . . . . . . . . . . . . . . . . . . . 13.1 Terms and Definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13.2 Abbreviated Terms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

4 SPECIFICATION REQUIREMENTS FOR NICKEL BASE ALLOY 718 (UNS N07718). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.1 Process Control Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24.2 Testing Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

5 CERTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

6 MARKING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

ANNEX A (INFORMATIVE) REFERENCE ALLOY 718 MICROSTRUCTURES . . 9

Tables1 Material Property Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52 Charpy V-notch Impact Toughness Requirements (10 mm

×

10 mm). . . . . . . . . . . 63 Hardness Requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Figures1 and 2 Acceptable Microstructure. Original Magnification was 100X for

Upper Photomicrograph and 500X for Lower Photomicrograph. . . . . . . . . . 93 and 4 Acceptable Microstructure. Original Magnification was 100X for

Upper Photomicrograph and 500X for Lower Photomicrograph. . . . . . . . . 105 and 6 Acceptable Microstructure with Isolated Grain Boundary Delta Phase.

Original Magnification was 100X for Upper Photomicrograph and500X for Lower Photomicrograph. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

7 and 8 Acceptable Microstructure with Isolated Grain Boundary Delta Phase. Original Magnification was 100X for Upper Photomicrograph and 500X for Lower Photomicrograph. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

9 and 10 Unacceptable Microstructure Due to Level of Acicular Delta Phase inthe Grain Boundaries. Original Magnification was 100X for Upper Photomicrograph and 500X for Lower Photomicrograph. . . . . . . . . . . . . . . 13

11 and 12 Unacceptable Microstructure Due to Level of Acicular Delta Phase.Original Magnification was 100X for Upper Photomicrograph and500X for Lower Photomicrograph. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

13 and 14 Unacceptable Microstructure Due to Level of Acicular Delta Phasein Grain Boundaries. Original Magnification was 100X for Upper Photomicrograph and 500X for Lower Photomicrograph. . . . . . . . . . . . . . . 15

15 and 16 Unacceptable Microstructure Due to Level of Acicular Delta Phasein Grain Boundaries. Original Magnification was 100X for Upper Photomicrograph and 500X for Lower Photomicrograph. . . . . . . . . . . . . . . 16

17 Unacceptable Microstructure Due to Level of Grain BoundaryPrecipitates. Original Magnification was 500X. . . . . . . . . . . . . . . . . . . . . . . 17

v



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1


1 Scope

1.1 PURPOSE

This document provides specification requirements for Nickel Base Alloy 718 (UNS N07718) that are intended to supplementthe existing requirements of API Spec 6A and ISO 10423.

These additional specification requirements include detailed process control requirements and detailed testing requirements.The purpose of these additional requirements is to ensure that the Nickel Base Alloy 718 used in the manufacture of API Spec 6Aor ISO 10423 pressure-containing and pressure-controlling components is not embrittled by the presence of an excessive level ofdeleterious phases.

1.2 APPLICABILITY

This standard is intended to apply to pressure containing and pressure controlling components covered by API Spec 6A andISO 10423, but is not invoked by API Spec 6A and ISO 10423. This standard is applicable when invoked by the equipment man-ufacturer or the equipment purchaser.

2 Normative References

The following normative documents contain provisions that, through reference in this text, constitute provisions of this stan-dard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties toagreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the norma-tive documents indicated below. For undated references, the latest edition of the normative document applies. Members of ISOand IEC maintain registers of currently valid standards.

API Spec 6A

Specification for Wellhead and Christmas Tree Equipment

ASTM

1

A 370

Standard Test Methods and Definitions for Mechanical Testing of Steel Products

A 604

Standard Test Method for Macroetch Testing of Consumable Electrode Remelted Steel Bars and Billets

B 880

General Requirements for Chemical Check Analysis Limits for Nickel, Nickel Alloys and Cobalt Alloys

E 10

Standard Test Method for Brinell Hardness Test of Metallic Materials

E 18

Standard Test Methods for Rockwell Hardness and Rockwell Superficial Hardness of Metallic Materials

E 112

Standard Test Methods for Determining Average Grain Size

E 354

Test Methods for Chemical Analysis of High-Temperature Electrical, Magnetic, and Other Similar Iron, Nickel and Cobalt Alloys

E 1181

Standard Test Methods for Characterizing Duplex Grain Sizes

E 1473

Test Methods for Chemical Analysis of Nickel, Cobalt, and High-Temperature Alloys

ISO

2

10423

Petroleum and natural gas industries—Drilling and production equipment—Wellhead and christmas tree equipment

3 Terms, Definitions and Abbreviated Terms

3.1 TERMS AND DEFINITIONS

For the purposes of this standard, the following terms and definitions apply:

3.1.1 deleterious phases:

Secondary phases present in the microstructure of an alloy that have a negative effect on thedesired mechanical properties, toughness, or corrosion resistance of the alloy.

1

ASTM International, 100 Barr Harbor Drive, West Conshohocken, Pennsylvania 19428-2959. www.astm.org

2

International Organization for Standardization, 1, rue de Varembé, Case postale 56, CH-1211 Geneva 20, Switzerland. www.iso.org



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2 API S

PECIFICATION

6A718

3.1.2 delta phase:

A secondary phase in Nickel Base Alloy 718. Delta phase can be globular or acicular, has an orthorhombiccrystal structure, and has a chemical composition described as Ni

3

Nb type.

3.1.3 total hot work reduction ratio:

The total hot work reduction ratio is defined as the product of the individual reductionratios achieved at each step in the hot work operation from ingot cross section to final hot work cross section, where the ingotcross section shall be the cross section of the ingot obtained after the last remelt step and any ingot grinding or surface preparationprior to hot working.

3.2 ABBREVIATED TERMS

For the purpose of this standard, the following abbreviated terms apply:

AOD Argon Oxygen DecarburizationEF Electric FurnaceEFR Electroflux Remelting (same as ESR) ER Equivalent RoundESR Electro-slag RemeltingQTC Qualification Test CouponVAR Vacuum Arc RemeltingVIM Vacuum Induction MeltingVOD Vacuum Oxygen Decarburization

4 Specification Requirements for Nickel Base Alloy 718 (UNS N07718)

4.1 PROCESS CONTROL REQUIREMENTS

4.1.1 Chemical Composition Requirements

4.1.1.1 Chemical Composition Limits

The chemical composition shall conform to the weight percent requirements of UNS N07718 as modified below.

4.1.1.2 Chemical Composition Frequency and Test Methods

The chemical composition shall be tested on a remelt ingot basis on product representative of a remelt ingot per ASTM E 354,ASTM E 1473 or a nationally or internationally recognized industry standard.

4.1.1.3 Check (Product) Analysis

When material is qualified by the use of a check (product) analysis performed on either the test coupon or a non-critical areaof the production material, the analysis shall conform to the check (product) analysis variation specified in ASTM B 880.

4.1.2 Melt Practice Requirements

4.1.2.1 Acceptable Melt Practices

The alloy shall be melted by one of the following sequences of processes:

Ni Cr Fe* Cb(Nb) + Ta Mo Ti Al C Co Mn

Min 50.0 17.0 — 4.87 2.80 0.80 0.40 — — —Max 55.0 21.0 Bal. 5.20 3.30 1.15 0.60 0.045 1.00 0.35

Si P S B Cu Pb Se Bi Ca** Mg**

Min — — — — — — — — — —Max 0.35 0.010 0.010 0.0060

(60 ppm)0.23 0.0010

(10 ppm)0.0005(5 ppm)

0.00005(0.5 ppm)

0.0030(30 ppm)

0.0060(60 ppm)

Notes: * Shall be determined arithmetically by difference or by direct measurement. ** To be determined if intentionally added.



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S

PECIFICATION

OF

N

ICKEL

B

ASE

A

LLOY

718 (UNS N07718)

FOR

O

IL

AND

G

AS

D

RILLING

AND

P

RODUCTION

E

QUIPMENT

3

a. Step 1—Basic electric furnace (EF).

Step 2—Either argon oxygen decarburization (AOD) or vacuum oxygen decarburization (VOD).

Step 3—Vacuum arc remelting (VAR).

Step 4—Additional VAR.

Or:

b. Step 1—Vacuum induction melting (VIM).

Step 2—Either electroslag remelting (ESR) or electroflux remelting (EFR) or vacuum arc remelting (VAR).

Optional Step 3—Electroslag remelting (ESR) or electroflux remelting (EFR) or vacuum arc remelting (VAR).

4.1.3 Forging and Hot Working Requirements

4.1.3.1 Hot Work Reduction Ratio

The minimum total hot work reduction ratio shall be 3.75:1

4.1.4 Heat Treating Requirements

4.1.4.1 Temperature Monitoring

The material temperature shall be measured by use of either a contact surface thermocouple or a heat sink as described in APISpec 6A or ISO 10423. The hold time shall not commence until the contact surface thermocouple or a heat sink reaches at least theminimum required material temperature.

4.1.4.2 Solution Annealing and Age Hardening

The production material and QTC(s) shall be solution annealed and age hardened in accordance with the following procedure:

Step 1—Solution anneal at a material temperature of 1870°F – 1925°F (1021°C – 1052°C) for one hour minimum to two and ahalf hours maximum.

Step 2—Cool in air, water, polymer or oil to ambient temperature.

Step 3—Age harden at a material temperature of 1425°F – 1475°F (774°C – 802°C) for six to eight hours.

Step 4—Air cool or faster to ambient temperature.

Optional Re-heat Treatment Steps—Complete re-heat treatment is permitted. Alternatively, re-aging within the parametersin Step 3 is permitted, provided the cumulative aging time does not exceed the maximum allowable aging time. All otherrequirements of the specification shall be met by material that has been subjected to either of these optional steps.

If the material is re-aged without re-solution annealing, the testing required by Sections 4.2.2, 4.2.3, 4.2.4, and 4.2.5 may beperformed on remnants of the original QTC, provided the remnants are re-aged with the production material they represent.

4.2 TESTING REQUIREMENTS

4.2.1 Macroetch Requirements

4.2.1.1 Test Location, Method and Frequency

A macroetch examination shall be performed. The macroetch examination shall be performed on either (a) or (b) as shownbelow:

a. Full transverse cross-section slices representative of the top and bottom of each final remelt ingot or product thereof. b. For product not tested by the mill and not identified as to its relative location within the ingot, the macroetch testing shall beperformed on a per billet, bar or other raw material product form basis. A full transverse cross-section slice shall be examinedfrom each end.



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4 API S

PECIFICATION

6A718

The full cross section slices shall be etched for examination. The acceptable etchants are as follows:

4.2.1.2 Macroetch Examination and Acceptance Criteria

The macrostructure of the slice shall be examined and rated to all four classes in ASTM A 604. The acceptance criteria are asfollows:

Class 1 (Freckles)—No worse than Severity AClass 2 (White Spots)—No worse than Severity AClass 3 (Radial Segregation)—No worse than Severity AClass 4 (Ring Pattern)—No worse than Severity A

4.2.2 Microstructural Analysis Requirement


Sample(s) of material with the same shape and equivalent round from each remelt ingot per heat treat lot shall be subjected to amicrostructural analysis.

The sample(s) to be examined shall be a minimum

1

/

4

in. (6 mm) square and oriented longitudinally to the primary axis of grainflow. If the cross section of the material is less than

1

/

4

in. (6 mm), then the sample(s) shall be full cross section. The microstruc-tural analysis shall be performed on material in the final heat treatment condition. Test locations shall be a minimum of 1.25 in.(32 mm) from a heat treated end surface.

For solid material, the center,

1

/

4

thickness and surface locations shall be evaluated. For hollow material, the mid-walllocation and both the inner and outer surfaces shall be evaluated.

The microstructural samples shall be etched for examination. The acceptable etchants are as follows:

4.2.2.2 Grain Size Evaluation

4.2.2.2.1 Grain Size

The average grain size shall be determined in accordance with ASTM E 112. The ASTM average grain size shall be pre-dominantly No. 3 or finer for

≤

10 in. (25.4 cm) cross section and No. 2 or finer for > 10 in. (25.4 cm) cross section.

4.2.2.2.2 Duplex Grain Size

No topological duplex grain size as defined and measured per ASTM E 1181 is allowed.

4.2.2.3 Metallographic Examination for Deleterious Phases

The microstructural samples shall be examined for deleterious phases. The microstructural samples shall be examined at 100Xand 500X using light microscopy.

Option A: Canada’s Etchant 100 ml H

2

SO

4

, 100 ml HF, 50 ml HNO

3

, 400 ml H

2

OEtch at 160°F – 180°F (71°C – 82°C)

Option B: Aqua Regia 200 ml HCl, 100 ml HNO

3

Option C: Kalling’s Etchant 200 ml Methanol, 200 ml HCl, 10 g CuCl

2

Option D: Hydrochloric—Peroxide H

2

O

2

(30%) 100 ml, HCl 200 ml, H

2

O 300 mlRemove stains with 50% HNO

3

Option A: Kalling’s No. 2 200 ml Methanol, 200 ml HCl, 10 g CuCl

2

Option B: Super Kalling’s 5 ml H

2

O

2

, 60 ml HCl, 6 g CuCl

2

Option C: Seven acids 300 ml HCl, 60 ml HNO

3

, 60 ml H

3

PO

3

, 30 ml 40% HF, 30 ml H

2

SO

4

, 30 g FeCl

3

(anhydrous), 60 ml CH

3

COOH, 300 ml H

2

O



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S

PECIFICATION

OF

N

ICKEL

B

ASE

A

LLOY

718 (UNS N07718)

FOR

O

IL

AND

G

AS

D

RILLING

AND

P

RODUCTION

E

QUIPMENT

5

The acceptance criteria are as follows:

a. The microstructure shall be free from continuous networks of secondary phases along grain boundaries or other unusualmicrostructural features, except for individual, isolated grains that are not representative of the bulk of the microstructure. Thepresence of discrete, isolated particles of delta phase or carbides is acceptable.b. The microstructure shall be free from acicular delta phase except in individual, isolated grains that are not representative of thebulk of the microstructure. In no case shall any individual grain be surrounded with acicular delta phase. c. There shall be no laves phase.

Note: Examination of the microstructural samples for laves phase is not required if the original melt source certifies that the material is free fromlaves phase.

The Reference Photomicrographs in Annex A are examples of acceptable and unacceptable microstructures. Material that is rejected for unacceptable microstructural features may be fully re-heat treated (solution annealed and age hard-

ened) in accordance with 4.1.4 and re-examined.If a heat treat lot is rejected, then the other pieces within the heat treat lot may be qualified on an individual piece basis. Mate-

rial containing rejectable metallographic locations may be accepted if the rejectable locations will be removed by machining.

4.2.3 Tensile Property Requirements


One tensile test shall be performed for each tested QTC. The test frequency shall be one test per remelt ingot per heat treat lot(batch) (as defined in API Spec 6A and ISO 10423) for material of the same size.

The QTC shall be either a prolongation (full cross section on thickest end) or sacrificial production part. For solid material, the test specimen shall be removed from a location at

1

/

4

thickness or deeper from the side or outer diameterand at least 1.25 in. (32 mm) from the end. For hollow material, the test specimen shall be removed from a mid-wall location andat least 1.25 in. (32 mm) from the end.

The test specimen and test method shall be in accordance with ASTM A 370.

4.2.3.2 Tensile Test Acceptance Criteria

The tensile properties shall meet the acceptance criteria as shown in Table 1.

4.2.4 Impact Toughness Requirements


Charpy V-notch impact testing shall be performed on all material in accordance with ASTM A 370. All tests shall be performedat or below –75°F (–60°C) regardless of API Spec 6A or ISO 10423 Temperature Classification.

Impact testing shall be performed on a set of three specimens. Specimens oriented transverse to the primary direction of grain flowshall be used unless the size or geometry of the QTC prevents the usage of transverse specimens (material less than 3 in. [76 mm] incross section). When transverse specimens cannot be used for these reasons, longitudinal specimens shall be used.

One set of Charpy V-notch impact tests shall be performed for each tested QTC. The test frequency shall be one set of tests per heatper remelt ingot per heat treat lot (batch) (as defined in API Spec 6A and ISO 10423) for material of the same size.

The QTC shall be either a prolongation (full cross section on thickest end) or sacrificial production part. For solid material, the test specimens shall be removed from a location at

1

/

4

thickness or deeper from the side or outer diameterand at least 1.25 in. (32 mm) from the end. For hollow material, the test specimens shall be removed from a mid-wall locationfrom the side and at least 1.25 in. (32 mm) from the end.

The test specimens and test method shall be in accordance with ASTM A 370.

Table 1—Material Property Requirements

Material Designation

QTC Cross Section Thicknessin. (cm)

0.2% Yield Strength min.

psi (MPa)

0.2% Yield Strength max.

psi (MPa)

Tensile Strength min.

psi (MPa)

Elongation in 4Dmin.%

Reduction of Areamin.%

120K

≤

10 (25.4) 120,000 (827) 145,000 (1000) 150,000 (1034) 20 35> 10 (25.4) 120,000 (827) 145,000 (1000) 150,000 (1034) 20 25



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6 API S

PECIFICATION

6A718

4.2.4.2 Charpy V-notch Acceptance Criteria

The average energy value for a set of three specimens shall meet or exceed the specified average. No more than one of thespecimens shall have an energy value below the specified average and it shall not be below the specified single minimum. Nospecimens shall have a lateral expansion below the specified value.

The adjustment factors for sub-size impact specimens in API Spec 6A shall apply to the absorbed energy values for all PSLs.Lateral expansion shall be as stated in the Table 2 regardless of specimen size.

4.2.5 Hardness Test Requirements


Each piece of production material and each QTC shall be hardness tested on or near the surface using the Brinell (10 mm ball,3000 kgf) method per ASTM E 10 or the Rockwell C method per ASTM E 18 after the final heat treatment cycle. Each piece of pro-duction material and each QTC shall have a minimum of one hardness test.

4.2.5.2 Hardness Test Acceptance Criteria

The hardness tests shall meet the acceptance criteria shown in Table 3.

4.2.6 Nondestructive Examination

The nondestructive examination requirements in API Spec 6A or ISO 10423 shall apply as required for the specified compo-nent type and PSL specified on the purchase order.

5 CertificationThe material supplier shall provide a certified test report to the equipment manufacturer containing the following information

as a minimum:

5.1 Chemical analysis results (see 4.1.1)

5.2 Melt practice utilized (see 4.1.2)

5.3 Name of melt source

5.4 Name of company performing the hot working operations (if different from melt source)

5.5 Name of company performing the heat treatment (if different from melt source)

5.6 Total hot work reduction ratio (see 4.1.3)

Table 2—Charpy V-notch Impact Toughness Requirements (10 mm × 10 mm)

Temperature QTCCross Section

Thickness

in. (cm)

Minimum impact valuePSL 1, 2, 3, and 4

Transverse Direction Longitudinal Direction

API Spec 6A Temperature Classification

Test Temperature

°F(°C)

Average Value

Ft-lbf (J)

Single Minimum

ValueFt-lbf (J)

Lateral Expansion

in. (mm)

Average Value

Ft-lbf (J)

Single Minimum

ValueFt-lbf (J)

Lateral Expansion

in. (mm)

All –75 (–60)or below

< 3 (7.6) Not applicable Not applicable Not applicable 50 (68) 45 (61) 0.015 (0.38)≥ 3 (7.6)

≤ 10 (25.4)35 (47) 30 (41) 0.015 (0.38) Not applicable Not applicable Not applicable

> 10 (25.4) 30 (41) 27 (37) 0.015 (0.38) Not applicable Not applicable Not applicable

Table 3—Hardness Requirements

Material DesignationMinimum Hardness

HBW (HRC) Maximum Hardness

HBW (HRC)

120K 298 (32) 363 (40)



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SPECIFICATION OF NICKEL BASE ALLOY 718 (UNS N07718) FOR OIL AND GAS DRILLING AND PRODUCTION EQUIPMENT 7

5.7 Actual heat treatment times and temperatures and cooling media3 (see 4.1.4)

5.8 Name of test laboratory

5.9 Statement that the material complies with the requirements of the macroetch examination (see 4.2.1)

5.10 Predominant grain size (see 4.2.2)

5.11 Statement of compliance with topological duplex grain size testing requirement (see 4.2.2)

5.12 Statement that the material complies with the requirements of the metallographic examination for deleterious phases4 (see4.2.2)

5.13 Tensile test results (see 4.2.3)

5.14 Impact test temperature, orientation, and results (see 4.2.4)

5.15 Hardness test results (see 4.2.5)

5.16 NDE results, if performed (see 4.2.6)

6 MarkingThe raw material shall be marked or tagged with identification traceable to the certification.

3Only the times, temperatures and cooling method need to be reported. However, the material manufacturer or material supplier shall maintaincopies of the heat treating charts showing the material temperature as measured by the contact surface thermocouple or heat sink for 5 yearsminimum following the date of heat treatment. 4The material manufacturer or material supplier shall retain the metallographic specimen mounts for 5 years minimum following the date of theexamination.



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9

ANNEX A(INFORMATIVE)

REFERENCE ALLOY 718 MICROSTRUCTURES

Figures 1 and 2—Acceptable Microstructure. Original Magnification was 100X for Upper Photomicrograph and 500X for Lower Photomicrograph.

200 µm

50 µm



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10 API SPECIFICATION 6A718

Figures 3 and 4—Acceptable Microstructure. Original Magnification was 100X for Upper Photomicrograph and500X for Lower Photomicrograph.

200 µm

50 µm



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Figures 5 and 6—Acceptable Microstructure with Isolated Grain Boundary Delta Phase. Original Magnification was 100X for Upper Photomicrograph and 500X for Lower Photomicrograph.

200 µm

50 µm



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Figures 7 and 8—Acceptable Microstructure with Isolated Grain Boundary Delta Phase. Original Magnification was 100X for Upper Photomicrograph and 500X for Lower Photomicrograph.

200 µm

50 µm



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Figures 9 and 10—Unacceptable Microstructure Due to Level of Acicular Delta Phase in the Grain Boundaries. Original Magnification was 100X for Upper Photomicrograph and 500X for Lower Photomicrograph.

100 µm

10 µm



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Figures 11 and 12—Unacceptable Microstructure Due to Level of Acicular Delta Phase. Original Magnification was 100X for Upper Photomicrograph and 500X for Lower Photomicrograph.

200 µm

50 µm



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Figures 13 and 14—Unacceptable Microstructure Due to Level of Acicular Delta Phase in Grain Boundaries. Original Magnification was 100X for Upper Photomicrograph and 500X for Lower Photomicrograph.

200 µm

50 µm



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Figures 15 and 16—Unacceptable Microstructure Due to Level of Acicular Delta Phase in Grain Boundaries. Original Magnification was 100X for Upper Photomicrograph and 500X for Lower Photomicrograph.

200 µm

50 µm



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Figure 17—Unacceptable Microstructure Due to Level of Grain Boundary Precipitates. Original Magnification was 500X.

50 µm



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